Bone marrow failure; venoocclusive hepatic disease: hyperbilirubinaemia, hepatomegaly, increased wt, portal HTN: splenomegaly, varices oesophageal, thrombocytopenia, increased hepatic enzyme, blood alkaline phosphatase & γ-glutamyl-transferase, jaundice, portal fibrosis, nodular regenerative hyperplasia, peliosis hepatitis. Stomatitis, GI disorder; venoocclusive hepatic disease in short-term cyclical therapy; hyperuricaemia, hyperuricosuria, urate nephropathy.